Worried about a red bump on my 1.5 year old Berner

Hi everyone,

This is my first time posting on this site but I am worried about a bump on my dogs nose. He is just over a year and a half years old. It just showed up 2 days ago and it feels hard on the inside. He has had a zit on his belly before but it does not seem like the same. I have attached a photo to help visualize what I'm talking about. We have a vet appointment tomorrow afternoon but I can't stop running scenarios in my head and am hoping someone else may be more knowledgeable on here.

(also please excuse my fiances awful nails)

Thank you!